I thought sure I saw it mentioned about the bomb that destroyed Hiroshima, regardless still not even close to planetary. The largest Hydrogen bomb in existence was the Tsar Bomba would barely destroy all of Houston. And the initial blast wouldn't destroy half of Houston, it's the thermal radiation that would do the job. The point is, even if the statement is not hyperbole it is massively less than planetary.
A hydrogen bomb has a 10 mile radius. A firecracker doesn't even kill someone if it explodes at point blank, let's say the radius is 2 feet. That means that the bomb is over 25 000 times more powerful than the firecracker, which means that Zeus' bolt is over 25 000 times more powerful than the hydrogen bomb. That's a radius of 250 000 miles. It would cover about 62 Earths.
There is a difference between engulfing something in a blast and actually destroying it. Most nukes don't even leave significant craters. The ones that do were underground.
Our entire world's supply of nukes couldn't even generate 1/4th as much power as the 2004 Indian Ocean earthquake.
100 billion nukes would not destroy the planet, and that lightning bolt feat isn't even close to planetary.